Propeller.



UNITED sTATEs PATENT oEEIcE.

MANSFIELD CO0KSEY, 0F BALTIMORE, MARYLAND.

PBOPELLER.

Specication of Letters Patent. Application led September 1, 1909. SerialNo. 515,600.

To all whom. it may concern:

Be it known that I, MANSEIELD CooxsEY, a citizen of the United States,residing at Baltimore, in the State of Maryland, have invented new anduseful Improvements in Propellers, of which the following is a speci-Y ltication.

This invention relates to propellers and has vfor an object to provide apropeller that can be stamped from a single piece 'of springy sheetmetal and bent at'two ends to form flukes; the said lukes being so ar`ranged that the water,- in operation ofthe propeller will be thrownoutwardly away from the center of the propeller bladeto relieve thelatter practicallyof all strain and resistance and allowing the blade torevolve with great rapidity or velocity.

Another object of the invention is top rovide a'l propeller wherein thecentral or bearing portion thereof will be of an equal diameter to thatof the respective flukes.

Other objects and advantages will be apparent as the nature of theinvention is better disclosed and it will be understood that changes canbe made within the scope of the claims without departing from the spiritof the invention.

In the drawings forming a portion of this specification and inv whichlike numerals of referenceV indicate similar parts in the severalvieWs:-Figure l is av plan view of a blank of sheet metal showing indotted lines the manner of forming my improved propeller. Fig. 2 is anedge view of the blank from which the pro eller is formed. Fig. 3 is aside view o the propeller. Fig. 4v is a A perspective view of thepropeller. l My improved propeller consists of a blank l which is ofrectangular form and as shown the blade is of anequal width through-outthe entire length of the blank. The blank is bent on a longitudinal linethroughout lthe longitudinal area of the same and at each end one cornerof the said blank is bent outf wa-rdly on a line approximately 45o tothe central portion of said blank. In this manner of bending the blankit will be seen lthat a substantially spiral fluke 2 is provided at`leach. end, one fluke extending in an opposite direction to the other.The propeller after being thus formed receives a bearing member?, inwhich is mounted one end of the propeller shaft 4.

- cident to the fact that the ukes are of spiral form and are larrangedto lie' at an opposite angle to each other they will in operation-PatentedMay 17, 1910.A

of the propeller throw the water -rom the center toward the outerextremity of the lukes,ithus relieving the central portion of thepropeller of any strain and allowing the same to revolve with greatrapidity or velocity. l

1. A propeller formed from a single blank of springyv sheet metal whosetransverse'area is the same throughout its entire length,

vof springy sheet metal whose 'thickness is the same throughout, thewidth ofthe said blank being the same throughout the entire transversearea and spiral vflukes at the ends of said blank.

In testimony whereof I'alix my signa-I ture in presence of twowitnesses.

' MANSEIELE oooxsEY.

Witnesses: I I

JOHN L. FLETCHER, JAMES A. KOEHL.

said blank being curved `throughout its lon-

